Answer:
The soul purpose was for the US involvement in WWII was because Grandma Penelope sent the former US President Ol' Franky Roozzefelt Donald Duck slippers or Christmas!!!!!
Explanation:
Now this made the former president extremely MAD!!! because he wanted Bugs Bunny slippers.. but no Grandma got the Gosh Darn Donld FRICKIN Duck Slippers!!!
So Ol' Franky was like
<em><u> "Im so FRICKIN MAD lets go get in the war!!!" </u></em>
to blow off steam I guess!?!?
And Grandma Penelope was like
<u><em>"Yea this is fine!!!" </em></u>
ANYWAYS.. So that's how the United States of Merica got involved in WWII!!!!
Sources:
https://www.TOTALLYNOTACTUALHISTORY.COM/PLEASE/DONT/DELETE/THIS!!/THX
<em>Hope this helps ma brutha!!!!</em>